Compat install logic by feedback for galaxy s7 on 7.0

release 3.0.1

Compat install on Android 8.0

添加后台任务停止功能

update message in default notifiers

update code

change named of some fields

Refactor DefaultFileChecker: add md5 support. and del file if check f…

…ailed before install

添加支持下载任务使用异步请求方式

Refactor force update logic: Delay exit logic when is force update